Tool-grinding appliance.



No. 676,413. Patented lune I8, I90I.

. c. v. sovs.

TOOL GRINDING APPLIANCE.

' (Application filed June 19, 1900.

(No Model.)

l UOIYIVEY-S No; 676,4!3. Patented lune l8, 190i.

0. v. sovs.

"I'OOL GRINDING APPLIANCE.

' (Application filed June 19, 1900. w (No Model.) 3 Sheets-Sheet 2.

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No. 676,4l3. Patented lune-J8, mm.

C. V. BUYS.

TOOL GRINDING APPLIANCE.

(Application filed June 19, 1900.)

(No Model.) 3 Sheets-She'et 3,

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WITNESSES.

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UNITED STATES PATENT omens.

CHARLES VERNON BOYS, OF LONDON, ENGLAND.

TOOL-GRINDINGAPPLIANCE S'PEGIEIGATION forming part of Letters Patent NO.676,413, dated. une 18, 1901. Application filed June 19, 1900. SerialNo. 20,366. We model.)

To all whom it may concern:

Be it known that 1, CHARLES VERNON BoYs, F. R. S., metropolitan gasreferee, a subject of the Queen of Great Britain and Ireland, and aresident of 66 Victoria street, West minster, London, S. W., England,have invented a certain new and useful Improvement in Tool-GrindingAppliances, (for which I have made application for Letters Patent inGreat Britain, No. 8,822, bearing date May 12, 1900,) of which thefollowing is a specification.

My invention relates to appliances for attachment to tool-grindingheads, and has for its object to enable tools such as are used in lathesand planing and other similar machines to be ground with extremeperfection and accuracy with an inexpensive appliance and withoutrequiring skilled labor.

My invention consists in providing in front of the grinding-wheels aguide-plate support having projections passing partly along both sidesof the grinding-wheel. On this support I place a guide-plate adapted tobe guided in a horizontal plane and parallel to the wheelaxle. The upperplate has two inclined surfaces, each of these being inclined to thesurface of the tool-support at the fixed angle required for clearance ofthe tool. The upper plate has also projections which pass on each sideof the grinding-wheel. Where the toolnose is to be ground at a definiteprofile-angle, I provide on each of the two inclined upper surfaces atool guide-bar capable of being set at any angle and provided withguiding means, so that the guide-bar can be freely moved back and forthin a direction parallel to the face of the grinding-wheel.

Referring to the accompanying drawings, which illustrate my inventionaccording to one form, Figure 1 is an'elevation showing a grinding-headhaving two grinding-wheels fitted with my tool-grindin g attachment.Fig. 2 is a plan of a guide-plate support with one guide-plate inposition. Fig. 3 is aplan of Fig. 1. Figs. 4 and 5 show plan andelevation, respectively, of a modified form of guideplate support.

(of the well-known form as used in the woodturning lathes) are providedfor carrying the guide-plate support I, which is provided with pins 2?and n, which project perpendicularly to the support, slide freely in thecarriers h and 7c, and are clamped in position by screws n) and w.

A groove 0 is provided on the face of the guide-plate support, whichplate runs parallel to the spindle and receives projections 13 and q,attached to the guide-plates r and s, so thatthe guide-plates maymovefreely ina horizontal plane and in a line parallel to the spindle 0..Lugs 00 project from the support Z on either side of the grinding-wheelsf and g. The two guide-plates r and s have inclined surfaces, theinclined surfaces ofplate r making equal angles with the horizontalplane, and the inclined surfaces of plate 3 making equal angles withthehorizontal plane, only each making an angle of about one degree lessthan the surfaces of plate 7". The guideplate 7' is placed opposite therough grinding- Wheel f, while the guide-plate s is placed opposite thefine grinding-wheel g. A portion is taken out of the centerof each ofthe plates 1" and s, so that more or less space, as required, can beleft between the projecting portions and the faces-of the wheels.

,Grooves y are cut in the inclined faces in lines parallel to theworking faces of the wheels to accommodate the guide-bars a, one

of which is shown in detail in Fig. 6 and consists of a bar which islocked in position by means of a bolt 2 and nut 3, the head of the bolt2 being oblong and sliding in the grooves y of the inclined surfaces.These guide-bars may be set to degree-lines drawn on the in on one ofthe inclined surfaces of the guideplate '1" and against a guide-bar s,which is set to the desired angle. The tool is then moved back andforward, the edge being kept in contact with the flat surface of thewheel until it is sufficiently ground. The inclined surface of theguide-plate serves to give the clearance-angle to the tool, while theguidebar fixes the profile-angle of the cutting edge. The tool is thentaken, with its guide-bar z, to the finishing-wheel g and placed on thecorresponding inclinedsurface of the guide-plate s,as shown in Fig. 1.The tool is then ground as before; but as the inclined surface of theguide-plate 5 makes an angle of about one degree less with thehorizontal plane than the inclined surfaces of plate r the edge only ofthe tool is fine ground and a slightly-smaller clearance-angle is thereformed.

If the tool has cutting edges on both sides, the second edge can beground by placing the tool on the other inclined surfaces of the plates7 and s and a second guide-bar a, similarly used.

If it is desired to grind screw-cutting tools and the like, a pivotedguide support, as shown in Figs. 4 and 5, is used. The pins t and u arehinged to the support Z, which may thus be set to anydesired angle. Thustools may be ground with the proper clearanceangle for cutting any pitchof screw. Horseshoe washers or distance-pieces at and 5 of differentthicknesses may be inserted between the guide-support and thesupport-carriers to give the clearance'angles for commonpitches ofthread, and thus eliminate the effect of the slope of the thread.

By means of this attachment machine-tools can be ground with extremeaccuracy without the necessity of skilled labor.

' Different angles of guide-plates may be used for differentclearance-angles.

I prefer to use grinding-wheels having thickened working faces,as shownat f, Fig. 1, so that the working face may remain flat in spite of Wear.

It is obvious that my invention, which I have shown as applied to agrinding-head with two wheels, may be used with a single wheel.

I wouldpoint out that the width of the gap shown between the parts 00ac, Fig. 2, and of the corresponding gaps in the guide-plates isconsiderably greater than the thickness of the grinding-wheels, so thatcranked tools may be accommodated.

It will be evident that guide-bars are only required where definiteprofile-angles have to be ground.

Guide-bars may be made to the definite profile-angles commonlyrequired-as, for instance, to the thirty degrees required for theSellars screw-thread. Adjustable guide-bars may then be unnecessary.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In tool-grinding machines, in combination, a guide-plate supportadapted to be clamped to the machine, guide-plates adapted to slide onsaid guide-plate support, inclined faces on each guide-plate, andguide-bars adapted to slide on said inclined faces, substantially asdescribed.

2. In tool-grinding machines, in combination, a guide-plate support,adapted to be clamped to the machine, said support having projectionsacting as supports for the guideplates on either side of thegrinding-wheel, guide-plates, having inclined surfaces and correspondingprojections, sliding upon the guide-plate support and being guided by agroove therein substantially as described.

3. In tool-grinding machines, in combination, a guide-plate supportadapted to be clamped to the machine, guide-plates adapted to slide onsaid guide-plate support, inclined faces on each guide-plate, saidinclined faces on one guide-plate making slightly-greater angles withthe guide-plate support than the inclined faces of the othersubstantially as described. I I

4. In tool-grinding machines, in combination, a guide-plate supportadapted to be clamped to the machine, guideplates adapted to slide onsaid guide-plate support, inclined faces on each guide-plate, andguidebars adapted to slide on said inclined faces, means for settingsaid guide-bars at any required angle, substantially as described.

5. In tool-grinding machines, in com-bina tion, a guide-plate supportadapted to be clamped to the machine, guide-plates adapted to slide onsaid guide-plate support, inclined, faces on each guide-plate, andguide-bars adapted to slide on said inclined faces, said guide-barsbeing permanently formed to defi nite angles most frequently requiredsubstan tially as described.

6. In tool-grinding machines, in combination, a guide-plate supportadapted to be clamped to the machine, by means permitting of its angulardisplacement in a vertical plane, guide-plates adapted to slide on saidguideplate support, inclined faces on each guideplate, and guide-barsadapted to slide on said inclined faces, substantially as described.

7. In tool-grinding machines, in combination, a guide-plate supportadapted to be clamped to the machine by means permitting of its angulardisplacement in a vertical plane, by two sockets with pivot ends havingshoulders adapted to rest on distance-pieces, for setting the angle ofthe support, guide-plates adapted to slide on said guide-platesupport,inclined faces on each guide-plate, and guidebars adapted to slide onsaid inclined faces, substantially as described.

8. In tool-grinding machines, in combination with the grinding-wheel, aguide-plate support having a recessed portion adjoining the edge of theperipheral edge of the grinding-wheel and projections adjacent to the0pposite side faces of the wheel, guide-plates having correspondingproject-ions and inclined surfaces and guide-bars adapted to slide onsaid inclined surfaces, substantially as described. 9. In tool-grindingappliances, in combination, a guide-plate support. adapted to be clampedto the machine, guide-plates adapted to slide on said gu'ide-p'latesupport; inclined faces on eacli gliide-plate, substantially as de=scribed. 16

In witness whereof I have hereunto set my hand in presence of twowitnesses.

. CHARLES VERNON BOYS; Witnessesi n I WALTER J. SKERTEN, MATTHEWATKiNsO'N ADAM.

